I'm confused by the OP, maybe post a specific hand as an example?

What you should be doing is evaluating your equity vs the range of your opponent and then comparing that to odds you're being offered as well as factors such as how likely they are to fold if you semi-bluff raise or how likely they are to fire again if you hit your draw (implied odds) or also the chances of you drawing dead anyway.

__________________
For Free Money, Poker Gifts and Rakeback I recommend PokerSourceOnline.

I have to recommend Cardrunners for superb poker coaching. It was honestly the single biggest improvement in my game signing up there! Sign-up fee might seem steep, but it pays itself back within weeks.